PDF malware analysis — malicious · 6ec4f9437e49dcfe

MALICIOUS

PDF

45.5 KB Created: 2021-06-03 07:50:20 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-01

MD5: fb5be7d01caf3cfb1f7b7a7feb04004f SHA-1: f3bf3522469863b861a9377caf265ac15bb766be SHA-256: 6ec4f9437e49dcfeac82fd68a75f33862589e8a8318d1d14b97ab4dd9fad9d97

182 Risk Score

Malware Insights

MITRE ATT&CK

T1566.001 Spearphishing Attachment T1203 Exploitation for Client Execution

This PDF document was flagged as malicious by an ML classifier. It uses a fake-CAPTCHA lure. The file embeds a large number of external links characteristic of an SEO link farm, routes users through malicious redirector infrastructure and presents a deceptive download button. Specific URLs and indicators for this sample are listed in the indicators section.

Machine Learning

Nyx PDF Classifier malicious score 0.9864

Heuristics 6

Small PDF contains mass external PDF link farm critical PDF_SEO_LINK_FARM

Small PDF contains many clickable external PDF links, mostly clustered on one host. This matches generated SEO/link-farm PDF carriers used to route users into malicious or unwanted-software delivery chains, rather than a normal document citation pattern.
PDF links to a 'free generator / game hack' redirector high PDF_GAME_HACK_REDIRECT_LURE

PDF's clickable action targets a redirector of the form /app/<id>/<slug>-game-hack — the landing-page shape of a large SEO 'free spins / generator / game hack' lure family that funnels victims through rotating disposable hosts to a malware/scam payload. The multi-link variants also trip ML/link-farm rules; this catches the single-link variants that otherwise score clean.
Fake CAPTCHA / human verification prompt high SE_FAKE_CAPTCHA

Document displays a fake CAPTCHA or human-verification prompt — used to trick users into running commands or pressing keyboard shortcuts
Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON

Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
External URI info PDF_URI

PDF contains an external URL action
Embedded URL info EMBEDDED_URL

One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
URL https://netcdn.online/app/431946152/how-to-hack-any-roblox-account-game-hack PDF link annotation
- http://juscor.com.br/ckfinder/userfiles/files/how-to-setup-a-minecraft-server-for-free_GM479516143.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/free-coin-master-spins-and-coins_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/20210-robux_GM431946152.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spins-may-11-2021_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-latest-mod-apk-free-download_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-link-today_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-spins-usa-2021_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-free-coins-and-spins-blogspot_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/teach-me-to-hack_GM431946152.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-https-coinms-net_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/free-robux-no-human-verification-2021_GM431946152.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/spin-and-coin-link_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/minecraft-pe-hacks-2021_GM479516143.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-link_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/free-roblox-accounts-with-robux-that-work-not-banned-2021_GM431946152.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/how-to-hack-a-roblox-account-2021_GM431946152.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-tool-for-pc_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/free-spins-coin-master-no-human-verification_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/free-spins-on-coin-master_GM406889139.pdfIn PDF document text
- http://juscor.com.br/ckfinder/userfiles/files/coin-master-hack-pro-gamers-com_GM406889139.pdfIn PDF document text
- http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

Filename	Kind	Source	Size
`stream_004_off00005227.bin`	decompressed-pdf-stream	PDF FlateDecoded stream at offset 0x5227	25872 bytes
SHA-256: `7b995532979d179292e77c9e3c7c0254b98ee297081e540b973cb66b67c57bb1`
`font_01_sfnt_off00008d78.bin`	pdf-font-stream	PDF embedded font (sfnt) at offset 0x8D78	18772 bytes
SHA-256: `d5ac01ba848f85c7af00746e0b4ab9643e0d1d2f53353368de6e0e250a854553`

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